Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence

Details Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence

2003-04-04

arxiv.org/abs/quant-ph/0304044v1

Phys. Rev. A 68 012310 (2003)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.68.012310

We present an all-optical implementation of quantum computation using semiconductor quantum dots. Quantum memory is represented by the spin of an excess electron stored in each dot. Two-qubit gates are realized by switching on trion-trion interactions between different dots. State selectivity is achieved via conditional laser excitation exploiting Pauli exclusion principle. Read-out is performed via a quantum-jump technique. We analyze the effect on our scheme's performance of the main imperfections present in real quantum dots: exciton decay, hole mixing and phonon decoherence. We introduce an adiabatic gate procedure that allows one to circumvent these effects, and evaluate quantitatively its fidelity.

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